China's cyberspace regulators have summoned Nvidia over security concerns about its H20 chips. They claim the chips can be tracked and turned off remotely. The meeting took place on Thursday, with regulators demanding explanations and materials from Nvidia. This comes two weeks after the U.S. lifted a block on the chips, allowing Nvidia to resume sales in China. The situation highlights ongoing tech tensions between the U.S. and China. Concerns over chip tracking and security have been raised by both Chinese regulators and U.S. lawmakers. The sale of advanced chips to China remains banned by the U.S.